GCC 7.4.0 release candidate

[Sebastian Huber]

Hello,

a GCC 7.4.0 release candidate is available. I would like to update the 
RSB to use GCC 7.4.0 for all targets which currently use GCC 7.3.0. This 
will change the type int32_t from long to int.

-- 
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber at embedded-brains.de
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